磁性活性炭的制备及其对选矿废水中丁基黄药的去除研究

通过共沉淀法将Fe₃O₄负载在活性炭上, 制备磁性活性炭MAC, 解决了普通活性炭存在的分离回收困难问题。将其用于吸附选矿废水中的丁基黄药, 考察了吸附时间、吸附剂用量和pH值等因素对吸附性能的影响, 结果表明, 在pH=7、吸附时间3 h、丁基黄药浓度100 mg/L、MAC用量0.6 g/L条件下, MAC对丁基黄药的去除率达99.73%。MAC对丁基黄药的吸附满足二级动力学方程和Langmuir等温模型。通过磁力对MAC进行回收, 回收率达98%。5次重复使用后MAC对丁基黄药去除率仍有76.59%, 是一种经济环保的吸附剂。

Preparation of Magnetic Activated Carbon and Its Application in Removal of Butyl Xanthate from Mineral Processing Wastewater

Magnetic activated carbon (MAC) was prepared by loading Fe₃O₄ on activated carbon using coprecipitation method, thus the problem in the separation-recovery with commonly-used activated carbon can be solved. When using MAC to adsorb butyl xanthate in mineral processing wastewater, the effects of adsorption time, adsorbent dosage and pH on its adsorption performance were investigated. The results show that under the conditions of pH=7, adsorption time of 3 h, butyl xanthate concentration of 100 mg/L and MAC dosage of 0.6 g/L, the removal rate of butyl xanthate can reach 99.73%. In addition, the adsorption of butyl xanthate conforms well with the second-order kinetic equation and Langmuir isothermal model. MAC has  proven to be an economical and environmentally friendly adsorbent, as 98% MAC can be reclaimed by using magnetic force and the butyl xanthate removal rate remains 76.59% after 5 times of repeated use.